Number of (n+2)X(3+2) 0..3 arrays with every 3X3 subblock row and column sum 2 4 5 or 7 and every diagonal and antidiagonal sum not 2 4 5 or 7.
A251918
Number of (n+2)X(3+2) 0..3 arrays with every 3X3 subblock row and column sum 2 4 5 or 7 and every diagonal and antidiagonal sum not 2 4 5 or 7.
Terms
- a(0) =2524a(1) =4624a(2) =6086a(3) =10820a(4) =27366a(5) =59760a(6) =153792a(7) =424648a(8) =1188644a(9) =3247774a(10) =9831616a(11) =27631982a(12) =83818706a(13) =238563390a(14) =729213256a(15) =2076327410a(16) =6367943136a(17) =18160895004a(18) =55719714944a(19) =159044646208a(20) =488184738886
External references
- oeis: A251918